Hanger insert for steel floor deck and the like

ABSTRACT

An elongate metal insert has a loop of flexible steel cable at its upper end and a threaded socket in its lower end. Through the use of a thin metal sheath member that is installed in a suitable hole in a horizontal sheet member of steel or plywood, the insert is positioned with its lower end exposed below the horizontal sheet member and its upper end above the same so that when concrete is poured onto the top of the horizontal sheet member it will cover the loop and permanently anchor the insert in the concrete. Thus, structural members may be secured to the hanger depending from the bottom of the concrete layer, through the sheet member of steel in the case of steel floor deck, or directly from the concrete where the plywood has been stripped therefrom.

[ 1 Mar. 26, 1974 United States Patent [191 Werstein HANGER INSERT FOR STEEL FLOOR DECK AND THE LIKE [75] Inventor: Frank A. Werstein, Long Beach, Primary Examiner price Ind.

Assistant Examiner-Mark H. Wolk Attorney, Agent, or Firm-James B. Raden; Delbert P. Warner [73] Assignee: lntemational Telephone and Telegraph Corporation, New York, N .Y.

ABSTRACT [22] Filed: 1971 An elongate metal insert has a loop of flexible steel A l. No; 214,274 cable at its upper end and a threaded socket in its lower end. Through the use of a thin metal sheath U 8 Cl 52/707 52/699 85,80 member that is installed in a suitable hole in a horizontal sheet member of steel or plywood, the insert is positioned with its lower end exposed below the horizontal sheet member and its upper end above the same so that when concrete is poured onto the to the horizontal sheet member it will cover the loo 52/707; 85/80; l5l/4l.75; 248/317 [51] Int.

[58] Field of Search p of p and permanently anchor the insert in the concrete. Thus, structural members may be secured to the hanger depending from the bottom of the concrete layer,

s N m RE n N U f steel through the sheet member of steel in the case 0 floor deck, or directly from the concrete where the plywood has been stripped therefrom.

18 Claims, 6 Drawing Figures HANGER INSERT FOR STEEL FLOOR DECK AND THE LIKE BACKGROUND OF THE INVENTION The invention herein is concerned with apparatus which is intended to be installed in the deck of a building during the construction thereof to provide dependingthangers below the deck. For example, through the use of the hanger inserts of the invention, one may support pipes and conduits, automatic sprinkler apparatus, electrical fixtures, and any other apparatus which would normally be depending from a ceiling.

What will be referred to herein as deck construction or decking is a type of construction which is extensively used for forming the floors of large steel or concrete frame buildings of multiple stories. The floor of one level is defined on the upper surface of a given deck while the ceiling of the lower level is defined by the lower surface of the same deck.

Two general types of deck construction are in use today in the construction of large buildings, these being the poured concrete type of deck and the steel floor deck. The more important of these is the steel floor deck due to its presently increased use in large steel frame buildings of multiple stories.

Fluted or corrugated sheet steel is utilized as a floor base and filled with a substantial layer of concrete poured in situ. Utility service conduits are laid in suitable formations of the sheet steel member prior to pouring concrete upon the upper surface of the member. There may be outlets for these conduits on the upper surface of the concrete layer which are prelocated in the concrete or otherwise identified to be used at a later time. The bottom of this layer of concrete is in intimate contact with the steel base whose underside is exposed below as the ceiling for the lower level. The resulting deck structure is strong and substantially fireproof.

The construction comprising poured concrete decking is relatively simple. The deck is defined by plywood forms supported suitably by temporary or permanent means. Steel reinforcing rods may be laid on the forms, the concrete is poured and permitted to set, after which the forms are stripped away. Utility service conduits and surface outlets may be provided in the area to be poured before pouring.

In the planning of a building, structures to be supported from the bottom of a deck are best located and inserts installed, either in the sheet steel or in the plywood form as the case may be, prior to pouring the concrete. The only alternative is to attempt to effect the installation from below after the concrete has set. This is a difficult and expensive technique. In the case of the steel floor deck, one must first cut or drill through the layer of steel and then use some form of concrete anchor. In the case of concrete decking, the concrete anchor may be installed directly after the forms have been pulled, but overhead installation of concrete anchors is nonetheless difficult despite the absence of the sheet steel. The workman is operating with debris continuously falling upon him.

The invention contemplates a type of hanger insert which obviates some problems arising in any attempts to provide hanger inserts for pre-installation.

First, the insert must be simple and strong so that it can be installed effectively and easily. Also, it must be economical and result in a strong installation below the deck after the concrete has set.

Secondly, the insert must not be readily pulled out or bent prior to the pouring of the concrete. This is important because until the concrete has been fully poured,

workmen may step on the inserts, accidentally kick them, or structures to be pre-set into the concrete may be moved against the inserts. The latter structures might be utility service conduits or reinforcing rods.

Certain other problems in connection with such hanger inserts are solved by the invention as will be seen.

SUMMARY OF THE INVENTION The hanger insert comprises a body of steel having its lower end constructed to secure a structural member thereto, its upper end provided with a loop of flexible steel cable permanently connected thereto and its center provided with means to connect the same, either to a horizontal sheet steel member or to a horizontal sheet wooden member. In use, the sheet steel member or wooden member as the case may be is drilled to receive a sheath member, the sheath member having means positioning same relative to the horizontal sheet and there being cooperating means on the sheath member and insert properly locating the one relative to the other.

Once the hanger insert has been installed in the sheath member, the concrete may be poured upon the horizontal sheet member covering the loop of steel cable and the upper end of the insert. When the concrete has set, the lower end of the insert will present a threaded socket or a stud or the like below the horizontal sheet member for connecting with bolts or other structural members.

In one version of the invention, there is a protecting cap over the threaded socket which a workman must break off before using the threaded socket.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a fragmentary sectional view taken through a portion of steel floor deck having a hanger insert constructed according to the invention installed therein, the latter being shown for the most part in elevation;

FIG. 2 is a fragmentary median sectional view taken through the hanger insert of FIG. 1;

FIG. 3 is a view similar to that of FIG. 1 but showing a modified form of the invention, and also showing the same installed in concrete decking prior to the removal of the wooden forms thereof;

FIG. 4 is a side elevational view of a sheath member used with the invention illustrated in FIG. 3;

FIG. 5 is a top plan view of the sheath member of FIG. 4; and

FIG. 6 is a perspective elevational view of a modified form of sheath member.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A previously explained, the hanger insert of the invention is designed to be installed in decking of the type which involves poured concrete prior to the pouring of the concrete so that the setting of the concrete will permanently anchor the insert in the deck.

In FIG. I there is illustrated a portion of steel floor deck comprising the horizontal sheet member 10 of steel having a layer of concrete 12 of substantial thickness above the same and in intimate contact therewith.

I having an upper cylindrical body portion 16, a lower cylindrical body portion 18 which has a threaded socket 20 axially provided therein and opening to the lower end 21. The upper end 22 has a loop 24 of steel cable anchored thereto by any suitable technique. For example, a transverse passageway 26 may be formed in said end 22, the free ends of a short length of cable inserted from opposite ends of the passageway, and the insert end 22 crushed or swaged in any suitable die permanently to clamp said ends in the passageway 26. In FIG. 1 the two ends are shown at 28 and 30 protruding from opposite sides of the upper end 22 and engaged by small protective sleeves 32 and 34.

The lower cylindrical body portion 18 of the insert 14 has a smaller diameter than the upper cylindrical body portion 16 which gives rise to a shoulder 36. Slightly below the shoulder 36 there is provided an annular groove 38 which is in the form of a band of reduced diameter.

The insert 14 operates in cooperation with a thin metal sheath member 40 which is formed of spring steel or the like. The lower end of the sheath member 40 is open at 42 but has its end slightly inturned as shown at 44. The body of the member 40 is split to aid in manufacturing the same from sheet metal, such a split being shown in FIGS. 4, 5,'and 6 at 50. At its upper end, the sheath member 40 has flangelike ears 52 which protrude radially outward of the member 40. Similar ears are so identified in the structures of FIGS. 4, 5, and 6. Immediately adjacent the ears 52 and separated axially therefrom by a distance which is sufficient to accommodate a sheet of steel of relatively thin gauge is a plurality of circumferentially spaced protruding fingers 54 each of which has been punched out of the body and bent laterally, the general direction in which the fingers extend being axial. Thus, there is a punched out slot 56 within which each finger 54 is disposed, the upper end of each finger 54 being connected to the sheath 40 at 58 and there being an inwardly extending free end of each finger at 60. The bend of each finger is designated 62.

It is preferred that the sheaths be formed with the bends 62 of each finger 54 protruding beyond the diameter of the body of the sheath member 40 and with the inner free ends 60 being located substantially radially inwardly of the body of the sheath members 40.

To install the hanger inserts 14, prior to the pouring of the concrete the location of the insert is established and marked and a hole is drilled in the steel sheet member 10 as shown at 64. This hole 64 has a diameter such that the body of the sheath 40 will freely pass through the same, but must be forced into the position shown in FIGS. 1 and 2 because of the protrusion of the fingers 54. Accordingly, the bends 62 of the fingers 54 engage the hole and yield as the sheath is being pressed downwardly, but spring back into their normal positions when they have passed through the hole 64.

The insert 14 may be pre-inserted in the sheath 40 or it may be inserted into the sheath after the sheath 40 itself has been installed. In either case, the lower body portion 18 is of a diameter which permits it freely to pass into the sheath member 40 until the shoulder 36 engages the ears 52 at which time the lower end 21 of the insert is engaged upon the inturned end 44 of the sheath 40. In the meantime, the interior free ends 60 of the fingers 54 have dropped into the annular groove 38, making it practically impossible to withdraw the insert from the sheath 40 without damaging the sheath and even then, only by exerting substantial force.

With the insert installed as described, concrete may now be poured upon the upper surface of the steel horizontal sheet 10. The loop 24 will be immersed in concrete 12 providing a permanent anchor for the insert since the embedment will be quite substantial. Until the concrete has been poured and even while it is being poured, the presence of the loop 24 will not interfere with anything done on top of the metal sheet member 10. It can be struck by objects, kicked, stepped upon and it will yield due to the inherent flexibility of steel cable, returning to its original position when permitted to do so. Objects left pressing upon the loop will not permanently distort the same or affect the anchoring capabilities thereof. The insert is thus not readily pulled out accidentally, and even if some pull is exerted, the locking engagement between the finger ends 60 and the groove 38 will oppose such action.

After the concrete has been poured and has set, the body of concrete l2 permanently anchors the insert in position. The lower surface of the sheet member 10 be comes the ceiling of the lower level and a workman can attach any structural object to the deck by threadedly engaging a bolt for the same into the socket 20 through the open end 42 of the sheath 40. No strenght is required of the sheath 40 since the tension from the depending structural member is transmitted through the insert 14 to the concrete 12. By suitablemodification, there may be a protruding stud instead of a threaded socket.

In FIG. 3 there is illustrated another form of the invention. Here, instead of using a transverse passageway 26 for accommodating the ends of the steel cable loop, an axial hole 26' is provided in the end 22 of the insert 14' and both ends of the loop 24 are inserted therein and said end 22 is crushed or swaged to lock the ends in position.

FIG. 3 also illustrates the use of the invention in the construction of a more conventioanl form of deck. Here the deck will comprise poured concrete 12' without the sheet steel member 10 on the bottom thereof. During the construction of such decking, a heavy plywood form is used to confine the concrete and as shown, the bottom of the deck will have a sheet member 10 of such plywood thereon prior to the pouring of the concrete. A typicalform will be made out of three-quarter inch thick plywood. The sheath member used in such case may be identical to the sheath member 40 of FIGS. 1 and 2, but advantageously, it may have a second set of fingers axially spaced below the fingers 54 already described so that the fingers 70 may spring out and engage below the bottom surface of the plywood sheet 10' when the sheath 40' is inserted in the hole 64' drilled in the plywood sheet 10'.

In all other respects, the insert 14' and the sheath member 40' are similar respectively to the insert 14 and the sheath 40 thus far described.

After the concrete of FIG. 3 has been set, the plywood forms will be stripped off the same, including the sheet 10' leaving the bare surface of the concrete 12' exposed. At this time, the sheath member 40' may have little or no support holding the same in position, unless a second groove similar to the groove 38 is provided in the same axially below the first groove 38. Some adhesion may be achieved because of the contact of the cars 52 with the concrete 12. None of this is of any consequence, however, since the insert 14' at this time will have substantially and permanently become embedded and anchored in the concrete 12'. Even if the sheath member 40' comes off when the plywood forms are stripped, it is of no consequence.

It will be obvious that a sheath member 40' constructed as shown in FIGS. 3 and 4 could be considered universal in use since it could be utilized for steel floor deck and for poured concrete deck as well.

FIG. 6 illustrates a form of sheath member 80 which differs from the sheath member 40 only in regard to the fact that the lower end of the sheath member 80 does not have the same construction as the sheath member 40'. Instead, there is an integral transverse disc 82 connected to the body of the sheath member 80 by means of a thin extension 84. When installed, the insert 14 or 14' will extend down to the position shown in broken lines. The threaded socket will thus be closed off by the disc 82 thereby being protected from dirt and debris which could damage the threads. Protection from moving objects is also afforded in this way. When the workman who is going to use the insert is ready to use the same, it is a simple matter to bend the disc 82 out of the way to provide access to the socket 20. The extension 84 is readily bent or cut to eliminate the disc 82, if desired.

The inserts 40, 40' and 80 are expandable due to their respective splits. Accordingly, they may be spread by the insertion of the elongate cylindrical members and hence the inside diamter may be the same as or even less than the outside diameter of the parts 18. It may be contracted to force it into the sheet member. Lateral rocking of the insert will thus permit yielding thereof.

Obviously, variations may be made in the structure of the invention without departing from the spirit or scope of the invention as defined in the appended claims. For example, instead of using stranded steel cable, as illustrated, one could use resilient or flexible wire having the required strength or resilient steel strips which will provide the desired flexiblity and will be embedded in a substantial volume of concrete.

Likewise, as indicated above, the lower portion of the cylindrical member 14 or 14 may be solid with a threaded stud protruding beyond the end 42 of the sheath member 40 or 40 so that structural members may be secured thereto using a hole in such structural members and a nut for engagement with the stud.

What it is desired to secure by Letters Patent of the United States is:

l. A hanger insert for installation in decking including a layer of concrete and a sheet member supporting the concrete at least prior to its being poured, said insert comprising A. an elongate metal member having a bottom end and a top end,

B. a hollow sheath member telescopically engaged with the elongate metal member along a portion of the length thereof,

C. means including flange-like ears integral to said hollow sheath member for supporting said elongate metal member in a disposition passing through a sheet member which is adapted to have concrete poured onto the upper surface of the sheet member, with the bottom portion of the elongate metal member protruding below the sheet member and the top portion of the elongate metal member protruding above the sheet member,

D. said elongate metal member including 1. a threaded socket to enable the securement of a structural member from the bottom portion thereof which structural member is adapted to depend from the decking to be formed,

2. a loop of flexible material anchored to the top portion thereof and adapted to be embedded in concrete to support said hanger insert from said concrete when the same is set, and

3. a groove integral to said elongate metal member to engage fingers integral to said hollow sheath member and lock said members together.

2. The hanger insert as claimed in claim 1 in which the flexible material of said loop comprises wire.

3. The hanger insert as claimed in claim 1 in which the flexible material of said loop comprises wire cable.

4. The hanger insert as claimed in claim 1 in which the flexible material of said loop comprises stranded wire cable.

5. The hanger insert as claimed in claim 1 in which the bottom portion structure comprises a threaded socket.

6. The hanger insert as claimed in claim 5 in which the flexible material of said loop comprises stranded wire cable.

7. A hanger insert for installation in decking including a layer of concrete and a sheet member supporting the concrete at lease prior to its being poured, said insert comprising:

A. an elongate metal member having a bottom end and a top end,

B. a hollow sheath member telescopically engaged with the elongate metal member along a portion of the length thereof,

C. means including elements of said hollow sheath member for supporting said elongate metal member in a disposition passing through a sheet member which is adapted to have concrete poured onto the upper surface of the sheet member, with the bottom portion of the elongate metal member protruding below the sheet member and the top portion of the elongate metal member protruding above the sheet member,

D. said elongate metal member including 1. structure to enable the securement of the structural member from the bottom portion thereof which structural member is adapted to depend from the decking to be formed,

2. a loop of flexible material anchored to the top portion thereof and adapted to be embedded in concrete to support said hanger insert from said concrete when the same is set, and

3. means enabling said elongate metal member to engage elements of said hollow sheath member and lock said members together,

E. the hollow sheath member being formed from sheet metal, to include 1. means adapted to be inserted through a predrilled hole in said sheet member of a size selected to accommodate said sheath member,

2. an overhang at the upper end thereof adapted to engage the upper surface of said sheet member to prevent the sheath member from passing through said sheet member,

3. means adjacent its upper end adapted resiliently to engage with said sheet member on the lower surface thereof to resist withdrawal of said sheath member from the sheet member when once installed, and

4. means at the lower end of the sheath member to provide access to the bottom end of the elongate metal member while supporting the same.

8. The hanger insert as claimed in claim 7 in which the said sheath member and elongate metal member have cooperating means limiting the extent to which the elongate member is telescopically insertable into the sheath member.

9. The hanger insert as claimed in claim 8 in which the last-mentioned means comprise a shoulder on the elongate metal member and the upper end of the sheath member having a diameter less than that of the shoulder.

10. The hanger insert as claimed in claim 7 in which said means adapted resiliently to engage said sheet member comprise one set of fingers circumferentially arranged around the sheath member and having a given spacing from the overhang thereof whereby when inserted through said predrilled hole the fingers will be depressed and will then spring outwardly after passing through said hole whereby to sandwich the sheet member between said overhang and said fingers.

11. The hanger as claimed in claim 10 in which there is a second 556? 'fihger's s'iia'ei' different distance from the overhang whereby to enable either of two different thicknesses of sheet member to be engaged by one or the other of said sets of fingers.

12. A hanger insert for installation in decking including a layer of concrete and a sheet member supporting the concrete at least prior to its being poured, and said insert comprising:

A. an elongate metal member having a bottom end and a top end,

B. means including a hollow sheath member having integral flange-like ears for supporting said elongate metal member in a sheet member which is adapted to have concrete poured onto the upper surface of the sheet member, with the bottom end of the elongate metal member protruding below the sheet member and the top end of the elongate metal member protruding above the sheet member,

C. said elongate metal member including 1. a threaded socket therein opening to the bottom end thereof to enable securement of a threaded structural member therein adapted to depend from the decking to be formed,

2. yieldable means at the top end thereof adapted to be embedded in concrete to support said hanger insert from said concrete when the same is set,

D. said supporting means comprising a sheath member adapted to be engaged through a predrilled hole in said sheet member and having said elongate metal member telescopically engaged therein, the bottom end of said sheath member having a protective cap covering the opening to said threaded socket but the cap adapted to be moved to give access to said opening when desired, and

E. said hollow sheath member including fingers integral thereto to cooperatively engage elements of said elongate metal member including a groove integral thereto and lock said members together.

13. In combination with the sheet steel member of a steel floor deck, a hanger insert engaged in a predrilled hole in said sheet steel member with a part of the insert disposed above the sheet steel member and another part of the insert disposed below the sheet steel member, said insert comprising:

A. an elongate cylindrical member of metal having an upper portion and a lower portion, the upper portion having secured thereto a loop of flexible metal adapted to be embedded in concrete poured on the upper surface of said sheet steel member, the lower portion having a formation to enable the securement of a structural member thereto depending from the bottom of said sheet steel member,

B. a sheath member comprising a hollow formation having an outer diameter slightly smaller than said predrilled hole, flange means at the upper and thereof and being engaged in said predrilled hole with the flange means overlying the sheet steel member and the majority of said sheath member depending from the sheet steel member,

C. the length of the'sheath' fn ei't'iberbeing substantially the same as the length of the lower portion of said elongate cylindrical member and the inner diameter of said sheath member being slightly smaller than the outer diameter of said lower portion of said elongate cylindrical member and telescopically engaged therewith, the construction of said sheath member at the bottom end thereof being such as to give access to the formation at the lower portion of the elongate cylindrical member, the upper portion of said cylindrical member being disposed above said sheet steel member,

D. the sheath member having means resiliently cngaging beneath said sheet steel member when said sheath member is fully engaged in said predrilled hole resisting withdrawal of said sheath member from said predrilled hole, and

E. means enabling said sheath member and said elongate cylindrical member to lock together.

14. The combination as claimed in claim 13 in which said sheath member and elongate cylindrical member have cooperating means substantially locking the same in said telescopical engagement.

15. The combination as claimed in claim 13 in which said last-mentioned means comprise a plurality of resilient fingers formed on said sheath member spaced from said flange means and adapted to yield when said sheath member is pushed through said predrilled hole and spring back after having passed the hole.

16. The combination as claimed in claim 15 in which said elongate cylindrical member has an annular groove in the lower portion thereof and said fingers have their free ends engaged in said annular groove whereby substantially to lock the elongate cylindrical member in telescopical engagement with said sheath means.

17. The combination as claimed in claim 13 in which the formation in the lower portion of the cylindrical member is a threaded socket, and in which the lower end of the sheath member is open.

18. The combination as claimed in claim 13 in which the formation in the lower portion of the cylindrical member is a threaded socket, and in which the lower end of the sheath member has a removable cap closing off said socket. 

1. A hanger insert for installation in decking including a layer of concrete and a sheet member supporting the concrete at least prior to its being poured, said insert comprising A. an elongate metal member having a bottom end and a top end, B. a hollow sheath member telescopically engaged with the elongate metal member along a portion of the length thereof, C. means including flange-like ears integral to said hollow sheath member for supporting said elongate metal member in a disposition passing through a sheet member which is adapted to have concrete poured onto the upper surface of the sheet member, with the bottom portion of the elongate metal member protruding below the sheet member and the top portion of the elongate metal member protruding above the sheet member, D. said elongate metal member including
 1. a threaded socket to enable the securement of a structural member from the bottom portion thereof which structural member is adapted to depend from the decking to be formed,
 2. a loop of flexible material anchored to the top portion thereof and adapted to be embedded in concrete to support said hanger insert from said concrete when the same is set, and
 3. a groove integral to said elongate metal member to engage fingers integral to said hollow sheath member and lock said members together.
 2. a loop of flexible material anchored to the top portion thereof and adapted to be embedded in concrete to support said hanger insert from said concrete when the same is set, and
 2. a loop of flexible material anchored to the top portion thereof and adapted to be embedded in concrete to support said hanger insert from said concrete when the same is set, and
 2. The hanger insert as claimed in claim 1 in which the flexible material of said loop comprises wire.
 2. yieldable means at the top end thereof adapted to be embedded in concrete To support said hanger insert from said concrete when the same is set, D. said supporting means comprising a sheath member adapted to be engaged through a predrilled hole in said sheet member and having said elongate metal member telescopically engaged therein, the bottom end of said sheath member having a protective cap covering the opening to said threaded socket but the cap adapted to be moved to give access to said opening when desired, and E. said hollow sheath member including fingers integral thereto to cooperatively engage elements of said elongate metal member including a groove integral thereto and lock said members together.
 2. an overhang at the upper end thereof adapted to engage the upper surface of said sheet member to prevent the sheath member from passing through said sheet member,
 3. means enabling said elongate metal member to engage elements of said hollow sheath member and lock said members together, E. the hollow sheath member being formed from sheet metal, to include
 3. means adjacent its upper end adapted resiliently to engage with said sheet member on the lower surface thereof to resist withdrawal of said sheath member from the sheet member when once installed, and
 3. a groove integral to said elongate metal member to engage fingers integral to said hollow sheath member and lock said members together.
 3. The hanger insert as claimed in claim 1 in which the flexible material of said loop comprises wire cable.
 4. The hanger insert as claimed in claim 1 in which the flexible material of said loop comprises stranded wire cable.
 4. means at the lower end of the sheath member to provide access to the bottom end of the elongate metal member while supporting the same.
 5. The hanger insert as claimed in claim 1 in which the bottom portion structure comprises a threaded socket.
 6. The hanger insert as claimed in claim 5 in which the flexible material of said loop comprises stranded wire cable.
 7. A hanger insert for installation in decking including a layer of concrete and a sheet member supporting the concrete at lease prior to its being poured, said insert comprising: A. an elongAte metal member having a bottom end and a top end, B. a hollow sheath member telescopically engaged with the elongate metal member along a portion of the length thereof, C. means including elements of said hollow sheath member for supporting said elongate metal member in a disposition passing through a sheet member which is adapted to have concrete poured onto the upper surface of the sheet member, with the bottom portion of the elongate metal member protruding below the sheet member and the top portion of the elongate metal member protruding above the sheet member, D. said elongate metal member including
 8. The hanger insert as claimed in claim 7 in which the said sheath member and elongate metal member have cooperating means limiting the extent to which the elongate member is telescopically insertable into the sheath member.
 9. The hanger insert as claimed in claim 8 in which the last-mentioned means comprise a shoulder on the elongate metal member and the upper end of the sheath member having a diameter less than that of the shoulder.
 10. The hanger insert as claimed in claim 7 in which said means adapted resiliently to engage said sheet member comprise one set of fingers circumferentially arranged around the sheath member and having a given spacing from the overhang thereof whereby when inserted through said predrilled hole the fingers will be depressed and will then spring outwardly after passing through said hole whereby to sandwich the sheet member between said overhang and said fingers.
 11. The hanger as claimed in claim 10 in whcih there is a second set of fingers spaced a different distance from the overhang whereby to enable either of two different thicknesses of sheet member to be engaged by one or the other of said sets of fingers.
 12. A hanger insert for installation in decking including a layer of concrete and a sheet member supporting the concrete at least prior to its being poured, and said insert comprising: A. an elongate metal member having a bottom end and a top end, B. means including a hollow sheath member having integral flange-like ears for supporting said elongate metal member in a sheet member which is adapted to have concrete poured onto the upper surface of the sheet member, with the bottom end of the elongate metal member protruding below the sheet member and the top end of the elongate metal member protruding above the sheet member, C. said elongate metal member including
 13. In combination with the sheet steel member of a steel floor deck, a hanger insert engaged in a predrilled hole in said sheet steel member with a part of the insert disposed above the sheet steel member and another part of the insert disposed below the sheet steel member, said insert comprising: A. an elongate cylindrical member of metal having an upper portion and a lower portion, the upper portion having secured thereto a loop of flexible metal adapted to be embedded in concrete poured on the upper surface of said sheet steel member, the lower portion having a formation to enable the securement of a structural member thereto depending from the bottom of said sheet steel member, B. a sheath member comprising a hollow formation having an outer diameter slightly smaller than said predrilled hole, flange means at the upper and thereof and being engaged in said predrilled hole with the flange means overlying the sheet steel member and the majority of sai sheath member depending from the sheet steel member, C. the length of the sheath member being substantially the same as the length of the lower portion of said elongate cylindrical member and the inner diameter of said sheath member being slightly smaller than the outer diameter of said lower portion of said elongate cylindrical member and telescopically engaged therewith, the construction of said sheath member at the bottom end thereof being such as to give access to the formation at the lower portion of the elongate cylindrical member, the upper portion of said cylindrical member being disposed above said sheet steel member, D. the sheath member having means resiliently engaging beneath said sheet steel member when said sheath member is fully engaged in said predrilled hole resisting withdrawal of said sheath member from said predrilled hole, and E. means enabling said sheath member and said elongate cylindrical member to lock together.
 14. The combination as claimed in claim 13 in which said sheath member and elongate cylindrical member have cooperating means substantially locking the same in said telescopical engagement.
 15. The combination as claimed in claim 13 in which said last-mentioned means comprise a plurality of resilient fingers formed on said sheath member spaced from said flange means and adapted to yield when said sheath member is pushed through said predrilled hole and spring back after having passed the hole.
 16. The combination as claimed in claim 15 in which said elongate cylindrical member has an annular groove in the lower portion thereof and said fingers have their free ends engaged in said annular groove whereby substantially to lock the elongate cylindrical member in telescopical engagement with said sheath means.
 17. The combination as claimed in claim 13 in which the formation in the lower portion of the cylindrical member is a threaded socket, and in which the lower end of the sheath member is open.
 18. The combination as claimed in claim 13 in which the formation in the lower portion of the cylindrical member is a threaded socket, and in which the lower end of the sheath member has a removable cap closing off said socket. 